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The neat thing is that 25fps content played out at 50fps doesn't use a lot more bandwidth than 25fps played out at 25fps because it only has to update every sec
by ErroneousBosh 2mo ago
The neat thing is that 25fps content played out at 50fps doesn't use a lot more bandwidth than 25fps played out at 25fps because it only has to update every second frame, assuming identical noise between frames.
And then you can go to field-per-frame 50fps footage when you need to say "camcorder".
- edgineer 2mo agoIt takes twice the file size to double the framerate without reducing visual quality of the original frames, whenever I try, with HEVC, AV1, etc. I can take a lower framerate video, run some software of constant size to interpolate the frames, and play back at a higher rate, but in practice I can't save that higher framerate video to a new mp4 file with small or constant size increase. It's got to be about linear.
- ErroneousBosh 2mo agoAre you doubling up frames for 25fps-in-50fps though? Because with long-GOP codecs like HEVC there ought to be just about no difference between pairs of frames. For sure with intra-only codecs twice the frame rate will be twice the file size.
- jasomill 2mo agoSurely this is a limitation of the encoder or a configuration problem, as encoding a video with faster motion at equivalent quality ordinarily requires a higher bit rate, and from the standpoint of the encoder, I wouldn't expect there to be a difference between half the frame rate and everything moving twice as fast.